Comment by albinoette

Tier 11 is obtained through a combination of for-gold purchases and tokens "of the Forlorn". This is a 5-piece set with normal and heroic versions/colorations.

As of 7.2 the normal tokens were updated and restored (from changes in 6.0.2) and the heroic tokens were updated. For either token, you can now click to "use" the token and automatically create a piece of tier for your current specialization. Normal tokens will create a piece of ilvl 359 gear and heroic tokens will create ilvl 372 gear. If you prefer "the old way" I've kept that information in the table - the vendors you can buy the items from with gold are the same NPCs you can exchange tokens with.

Tokens are separated by class into 3 groups (there is no tier 11 for monks or demon hunters):